I did run a boot time scan but it did not fix the problem.
The situation is as follows.
Computer boots correctly.
Works fine and fast for a while.
I get a Malicious url in svchost.exe message.
After that the browser starts redirecting weirdly.
After a short while now I get another avast warning from svchost.
At some point I also get a windows error message saying that svchost,exe was unable to write to memory.
Computer gets progressivly slow until it completely crashes.
Heres my last mbam log:
Malwarebytes' Anti-Malware 1.46
www.malwarebytes.orgDatabase version: 5184
Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702
11/30/2010 3:32:18 PM
mbam-log-2010-11-30 (15-32-18).txt
Scan type: Quick scan
Objects scanned: 189583
Time elapsed: 35 minute(s), 45 second(s)
Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0
Memory Processes Infected:
(No malicious items detected)
Memory Modules Infected:
(No malicious items detected)
Registry Keys Infected:
(No malicious items detected)
Registry Values Infected:
(No malicious items detected)
Registry Data Items Infected:
(No malicious items detected)
Folders Infected:
(No malicious items detected)
Files Infected:
(No malicious items detected)