What is STEAMPOWERE.COM & STEAMGAMES.COM?

[lexr]

Both of these websites have made large withdrawals from my bank account
200€, 100€ & 50€. I have checked my computer for any viruses etc there're none.
I am from norway and I do not shop online unless its through the steam client.

Someone please help me.

[Bumbefly (we/All)]

Steamgames.com = the Legit SteamStore. Are you sure you did not forget a "D" at the end of "Steampowere"? I can not find a spoof-site like that. If there is a "d" at the end, that's legit Steam as well.

However that does not mean the use of SteamStore has been Legit at that time. Seems you have been fished Big Time. You need to protect your Steam Account, your Bank Account and for safety you might want to protect some more accounts as well, like your Email, computer-account(s) and other accounts where you have purchased something recently.

De-authorize all other computers in Steam Settings -> Mannage Account Security. If there's such a setting on your online bank-acc. do it there as well.
Reset modem, router and WiFI.

Check your transactions via [your nick] at the right top corner in the Steam Client -> Account Details.

For your Bank- and Steam accounts you have the option to block them totally yet temporary. I'ld suggest you do that. Note, if you do, you can't play on any computer untill this is resolved.

Contact Steam Support and your bank. Do NOT order your bank to perform a charge-back YET, not before you have an OK from a person at Steam Support (at first you could get a computerized standard answer from Steam Support).

As Steam Support can take a lot of time to finaly adfress your ticket in person, maybe giving your bank permission to contact Steam Support can speed up the proces (i think that is needed, i hope Steam Support an your bank are willing to do that).

I don't know your level of proficiency with AV/AM scans but since you ask here i don't think you are experienced. Mallicious activity can be hidden from scans, thus the fact that a scan performed by yourself did not find anything is no guarantee there is nothing to be found on your computer(s). Have it (them) checked by an expert at Support/forum of your AV/AM of choise, on forum of a computermagazine or by a nearby Shop-technician (choose 1, their tools can seriously hinder each other if you go to multiple support/forums).
At the right time, they'll advise you when to reset modem router WiFi and passwords oncemore.

&*&*&*&*&*&*&*&*&*&*&*&*

Here's some waitingroom reading fo you.
Changing your Steam account password and secret question
Reclaiming a Hijacked Steam Account
Steam hijackpolicy

Articles dealing with what to do and Steam's policies should your account be hijacked or items stolen:
https://support.steampowered.com/kb_article.php?ref=6633-TANM-9707&l=english
https://support.steampowered.com/kb_article.php?ref=7623-IOFX-1021&l=english

Regaining Control of a Hijacked Steam Account (also in Russian)
http://steamcommunity.com/sharedfiles/filedetails/?id=337490163&insideModal=0
http://www.reddit.com/r/Steam/wiki/scamtypes

So you've been Hijacked, Guide written by Hayden (English)
http://steamcommunity.com/sharedfiles/filedetails/?id=288873991

[DirtyFishy]

As long as you only buy from the Steam client and also SteamPowered.com is the official one but make sure the URL Bar is green when you buy.

[KillahInstinct]

Steamgames.com
Steampowered.com
Steamcommunity.com

Are all 3 legit Steam-sites. Typing the first in will redirect you to the middle one. The last one is used for all community/social stuff